/* ----------------------------------------------------------------------------
* Copyright (C) 2010 ARM Limited. All rights reserved.
*
* $Date:        15. February 2012
* $Revision: 	V1.1.0
*
* Project: 	    CMSIS DSP Library
* Title:        arm_mat_add_f32.c
*
* Description:	Floating-point matrix addition
*
* Target Processor: Cortex-M4/Cortex-M3/Cortex-M0
*
* Version 1.1.0 2012/02/15
*    Updated with more optimizations, bug fixes and minor API changes.
*
* Version 1.0.10 2011/7/15
*    Big Endian support added and Merged M0 and M3/M4 Source code.
*
* Version 1.0.3 2010/11/29
*    Re-organized the CMSIS folders and updated documentation.
*
* Version 1.0.2 2010/11/11
*    Documentation updated.
*
* Version 1.0.1 2010/10/05
*    Production release and review comments incorporated.
*
* Version 1.0.0 2010/09/20
*    Production release and review comments incorporated.
*
* Version 0.0.5  2010/04/26
*    incorporated review comments and updated with latest CMSIS layer
*
* Version 0.0.3  2010/03/10
*    Initial version
* -------------------------------------------------------------------------- */

#include "arm_math.h"

/**
 * @ingroup groupMatrix
 */

/**
 * @defgroup MatrixAdd Matrix Addition
 *
 * Adds two matrices.
 * \image html MatrixAddition.gif "Addition of two 3 x 3 matrices"
 *
 * The functions check to make sure that
 * <code>pSrcA</code>, <code>pSrcB</code>, and <code>pDst</code> have the same
 * number of rows and columns.
 */

/**
 * @addtogroup MatrixAdd
 * @{
 */


/**
 * @brief Floating-point matrix addition.
 * @param[in]       *pSrcA points to the first input matrix structure
 * @param[in]       *pSrcB points to the second input matrix structure
 * @param[out]      *pDst points to output matrix structure
 * @return     		The function returns either
 * <code>ARM_MATH_SIZE_MISMATCH</code> or <code>ARM_MATH_SUCCESS</code> based on the outcome of size checking.
 */

arm_status arm_mat_add_f32(
    const arm_matrix_instance_f32* pSrcA,
    const arm_matrix_instance_f32* pSrcB,
    arm_matrix_instance_f32* pDst)
{
	float32_t* pIn1 = pSrcA->pData;                /* input data matrix pointer A  */
	float32_t* pIn2 = pSrcB->pData;                /* input data matrix pointer B  */
	float32_t* pOut = pDst->pData;                 /* output data matrix pointer   */

#ifndef ARM_MATH_CM0

	float32_t inA1, inA2, inB1, inB2, out1, out2;  /* temporary variables */

#endif //      #ifndef ARM_MATH_CM0

	uint32_t numSamples;                           /* total number of elements in the matrix  */
	uint32_t blkCnt;                               /* loop counters */
	arm_status status;                             /* status of matrix addition */

#ifdef ARM_MATH_MATRIX_CHECK

	/* Check for matrix mismatch condition */
	if((pSrcA->numRows != pSrcB->numRows) ||
	        (pSrcA->numCols != pSrcB->numCols) ||
	        (pSrcA->numRows != pDst->numRows) || (pSrcA->numCols != pDst->numCols)) {
		/* Set status as ARM_MATH_SIZE_MISMATCH */
		status = ARM_MATH_SIZE_MISMATCH;
	} else
#endif
	{

		/* Total number of samples in the input matrix */
		numSamples = (uint32_t) pSrcA->numRows * pSrcA->numCols;

#ifndef ARM_MATH_CM0

		/* Loop unrolling */
		blkCnt = numSamples >> 2u;

		/* First part of the processing with loop unrolling.  Compute 4 outputs at a time.
		 ** a second loop below computes the remaining 1 to 3 samples. */
		while(blkCnt > 0u) {
			/* C(m,n) = A(m,n) + B(m,n) */
			/* Add and then store the results in the destination buffer. */
			/* Read values from source A */
			inA1 = pIn1[0];

			/* Read values from source B */
			inB1 = pIn2[0];

			/* Read values from source A */
			inA2 = pIn1[1];

			/* out = sourceA + sourceB */
			out1 = inA1 + inB1;

			/* Read values from source B */
			inB2 = pIn2[1];

			/* Read values from source A */
			inA1 = pIn1[2];

			/* out = sourceA + sourceB */
			out2 = inA2 + inB2;

			/* Read values from source B */
			inB1 = pIn2[2];

			/* Store result in destination */
			pOut[0] = out1;
			pOut[1] = out2;

			/* Read values from source A */
			inA2 = pIn1[3];

			/* Read values from source B */
			inB2 = pIn2[3];

			/* out = sourceA + sourceB */
			out1 = inA1 + inB1;

			/* out = sourceA + sourceB */
			out2 = inA2 + inB2;

			/* Store result in destination */
			pOut[2] = out1;

			/* Store result in destination */
			pOut[3] = out2;


			/* update pointers to process next sampels */
			pIn1 += 4u;
			pIn2 += 4u;
			pOut += 4u;
			/* Decrement the loop counter */
			blkCnt--;
		}

		/* If the numSamples is not a multiple of 4, compute any remaining output samples here.
		 ** No loop unrolling is used. */
		blkCnt = numSamples % 0x4u;

#else

		/* Run the below code for Cortex-M0 */

		/* Initialize blkCnt with number of samples */
		blkCnt = numSamples;

#endif /* #ifndef ARM_MATH_CM0 */

		while(blkCnt > 0u) {
			/* C(m,n) = A(m,n) + B(m,n) */
			/* Add and then store the results in the destination buffer. */
			*pOut++ = (*pIn1++) + (*pIn2++);

			/* Decrement the loop counter */
			blkCnt--;
		}

		/* set status as ARM_MATH_SUCCESS */
		status = ARM_MATH_SUCCESS;

	}

	/* Return to application */
	return (status);
}

/**
 * @} end of MatrixAdd group
 */
